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annotate rust/hg-core/src/filepatterns.rs @ 42454:48f1f864d928

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rust-regex: fix shortcut for exact matches The current shortcut for rootglobs that can be simplified to exact matches does not work, it instead treats the pattern as a regex, which is not the same thing. This changes fixes the behavior and introduces a test for this behavior. Differential Revision: https://phab.mercurial-scm.org/D6489
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 06 Jun 2019 18:37:21 +0200
parents 9609430d3625
children a4a468b00d44
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use crate::{LineNumber, PatternError, PatternFileError};
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2 use regex::bytes::Regex;
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3 use std::collections::HashMap;
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4 use std::fs::File;
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5 use std::io::Read;
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6 use std::vec::Vec;
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7 use utils::files::get_path_from_bytes;
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8 use utils::{replace_slice, SliceExt};
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9
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10 lazy_static! {
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11 static ref reescape: Vec<Vec<u8>> = {
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12 let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect();
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13 let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c";
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14 for byte in to_escape {
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15 v[*byte as usize].insert(0, b'\\');
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16 }
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17 v
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18 };
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19 }
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20
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21 /// These are matched in order
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22 const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] =
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23 &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")];
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24
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25 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
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26 pub enum PatternSyntax {
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27 Regexp,
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28 /// Glob that matches at the front of the path
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29 RootGlob,
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30 /// Glob that matches at any suffix of the path (still anchored at slashes)
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31 Glob,
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32 Path,
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33 RelPath,
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34 RelGlob,
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35 RelRegexp,
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36 RootFiles,
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37 }
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38
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39 /// Transforms a glob pattern into a regex
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40 fn glob_to_re(pat: &[u8]) -> Vec<u8> {
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41 let mut input = pat;
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42 let mut res: Vec<u8> = vec![];
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43 let mut group_depth = 0;
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44
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45 while let Some((c, rest)) = input.split_first() {
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46 input = rest;
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47
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48 match c {
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49 b'*' => {
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50 for (source, repl) in GLOB_REPLACEMENTS {
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51 if input.starts_with(source) {
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52 input = &input[source.len()..];
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53 res.extend(*repl);
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54 break;
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55 }
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56 }
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57 }
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58 b'?' => res.extend(b"."),
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59 b'[' => {
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60 match input.iter().skip(1).position(|b| *b == b']') {
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61 None => res.extend(b"\\["),
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62 Some(end) => {
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63 // Account for the one we skipped
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64 let end = end + 1;
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65
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66 res.extend(b"[");
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67
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68 for (i, b) in input[..end].iter().enumerate() {
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69 if *b == b'!' && i == 0 {
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70 res.extend(b"^")
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71 } else if *b == b'^' && i == 0 {
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72 res.extend(b"\\^")
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73 } else if *b == b'\\' {
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74 res.extend(b"\\\\")
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75 } else {
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76 res.push(*b)
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77 }
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78 }
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79 res.extend(b"]");
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80 input = &input[end + 1..];
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81 }
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82 }
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83 }
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84 b'{' => {
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85 group_depth += 1;
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86 res.extend(b"(?:")
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87 }
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88 b'}' if group_depth > 0 => {
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89 group_depth -= 1;
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90 res.extend(b")");
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91 }
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92 b',' if group_depth > 0 => res.extend(b"|"),
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93 b'\\' => {
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94 let c = {
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95 if let Some((c, rest)) = input.split_first() {
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96 input = rest;
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97 c
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98 } else {
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99 c
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100 }
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101 };
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102 res.extend(&reescape[*c as usize])
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103 }
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104 _ => res.extend(&reescape[*c as usize]),
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105 }
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106 }
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107 res
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108 }
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109
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110 fn escape_pattern(pattern: &[u8]) -> Vec<u8> {
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111 pattern
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112 .iter()
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113 .flat_map(|c| reescape[*c as usize].clone())
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114 .collect()
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115 }
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116
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117 fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> {
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118 match kind {
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119 b"re" => Ok(PatternSyntax::Regexp),
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120 b"path" => Ok(PatternSyntax::Path),
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121 b"relpath" => Ok(PatternSyntax::RelPath),
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122 b"rootfilesin" => Ok(PatternSyntax::RootFiles),
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123 b"relglob" => Ok(PatternSyntax::RelGlob),
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124 b"relre" => Ok(PatternSyntax::RelRegexp),
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125 b"glob" => Ok(PatternSyntax::Glob),
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126 b"rootglob" => Ok(PatternSyntax::RootGlob),
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127 _ => Err(PatternError::UnsupportedSyntax(
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128 String::from_utf8_lossy(kind).to_string(),
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129 )),
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130 }
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131 }
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132
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133 /// Builds the regex that corresponds to the given pattern.
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134 /// If within a `syntax: regexp` context, returns the pattern,
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135 /// otherwise, returns the corresponding regex.
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136 fn _build_single_regex(
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137 syntax: PatternSyntax,
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138 pattern: &[u8],
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139 globsuffix: &[u8],
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140 ) -> Vec<u8> {
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141 if pattern.is_empty() {
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142 return vec![];
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143 }
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144 match syntax {
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145 PatternSyntax::Regexp => pattern.to_owned(),
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146 PatternSyntax::RelRegexp => {
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147 if pattern[0] == b'^' {
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148 return pattern.to_owned();
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149 }
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150 let mut res = b".*".to_vec();
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151 res.extend(pattern);
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152 res
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153 }
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154 PatternSyntax::Path | PatternSyntax::RelPath => {
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155 if pattern == b"." {
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156 return vec![];
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157 }
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158 let mut pattern = escape_pattern(pattern);
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159 pattern.extend(b"(?:/|$)");
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160 pattern
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161 }
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162 PatternSyntax::RootFiles => {
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163 let mut res = if pattern == b"." {
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164 vec![]
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165 } else {
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166 // Pattern is a directory name.
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167 let mut as_vec: Vec<u8> = escape_pattern(pattern);
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168 as_vec.push(b'/');
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169 as_vec
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170 };
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171
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172 // Anything after the pattern must be a non-directory.
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173 res.extend(b"[^/]+$");
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174 res
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175 }
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176 PatternSyntax::Glob
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177 | PatternSyntax::RelGlob
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178 | PatternSyntax::RootGlob => {
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179 let mut res: Vec<u8> = vec![];
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180 if syntax == PatternSyntax::RelGlob {
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181 res.extend(b"(?:|.*/)");
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182 }
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183
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184 res.extend(glob_to_re(pattern));
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185 res.extend(globsuffix.iter());
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186 res
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187 }
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188 }
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189 }
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190
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191 const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
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192 [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];
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193
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194 /// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs
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195 /// that don't need to be transformed into a regex.
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196 pub fn build_single_regex(
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197 kind: &[u8],
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198 pat: &[u8],
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199 globsuffix: &[u8],
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200 ) -> Result<Vec<u8>, PatternError> {
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201 let enum_kind = parse_pattern_syntax(kind)?;
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202 if enum_kind == PatternSyntax::RootGlob
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203 && !pat.iter().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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204 {
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205 let mut escaped = escape_pattern(pat);
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206 escaped.extend(b"(?:/|$)");
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207 Ok(escaped)
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208 } else {
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209 Ok(_build_single_regex(enum_kind, pat, globsuffix))
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210 }
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211 }
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212
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213 lazy_static! {
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214 static ref SYNTAXES: HashMap<&'static [u8], &'static [u8]> = {
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215 let mut m = HashMap::new();
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216
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217 m.insert(b"re".as_ref(), b"relre:".as_ref());
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218 m.insert(b"regexp".as_ref(), b"relre:".as_ref());
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219 m.insert(b"glob".as_ref(), b"relglob:".as_ref());
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220 m.insert(b"rootglob".as_ref(), b"rootglob:".as_ref());
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221 m.insert(b"include".as_ref(), b"include".as_ref());
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222 m.insert(b"subinclude".as_ref(), b"subinclude".as_ref());
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223 m
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224 };
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225 }
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226
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227 pub type PatternTuple = (Vec<u8>, LineNumber, Vec<u8>);
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228 type WarningTuple = (String, String);
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229
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230 pub fn parse_pattern_file_contents(
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231 lines: &[u8],
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232 file_path: &[u8],
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233 warn: bool,
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234 ) -> (Vec<PatternTuple>, Vec<WarningTuple>) {
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235 let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap();
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236 let mut inputs: Vec<PatternTuple> = vec![];
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237 let mut warnings: Vec<WarningTuple> = vec![];
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238
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239 let mut current_syntax = b"relre:".as_ref();
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240
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241 for (line_number, mut line) in lines.split(|c| *c == b'\n').enumerate() {
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242 let line_number = line_number + 1;
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243
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244 if line.contains(&('#' as u8)) {
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245 if let Some(cap) = comment_regex.captures(line) {
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246 line = &line[..cap.get(1).unwrap().end()]
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247 }
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248 let mut line = line.to_owned();
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249 replace_slice(&mut line, br"\#", b"#");
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250 }
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251
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252 let mut line = line.trim_end();
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253
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254 if line.is_empty() {
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255 continue;
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256 }
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257
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258 if line.starts_with(b"syntax:") {
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259 let syntax = line[b"syntax:".len()..].trim();
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260
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261 if let Some(rel_syntax) = SYNTAXES.get(syntax) {
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262 current_syntax = rel_syntax;
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263 } else if warn {
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264 warnings.push((
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265 String::from_utf8_lossy(file_path).to_string(),
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266 String::from_utf8_lossy(syntax).to_string(),
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267 ));
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268 }
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269 continue;
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270 }
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271
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272 let mut line_syntax: &[u8] = &current_syntax;
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273
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274 for (s, rels) in SYNTAXES.iter() {
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275 if line.starts_with(rels) {
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276 line_syntax = rels;
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277 line = &line[rels.len()..];
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278 break;
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279 } else if line.starts_with(&[s, b":".as_ref()].concat()) {
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280 line_syntax = rels;
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281 line = &line[s.len() + 1..];
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282 break;
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283 }
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284 }
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285
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286 inputs.push((
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287 [line_syntax, line].concat(),
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288 line_number,
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289 line.to_owned(),
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290 ));
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291 }
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292 (inputs, warnings)
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293 }
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294
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295 pub fn read_pattern_file(
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296 file_path: &[u8],
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297 warn: bool,
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298 ) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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299 let mut f = File::open(get_path_from_bytes(file_path))?;
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300 let mut contents = Vec::new();
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301
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302 f.read_to_end(&mut contents)?;
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303
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304 Ok(parse_pattern_file_contents(&contents, file_path, warn))
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305 }
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306
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307 #[cfg(test)]
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308 mod tests {
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309 use super::*;
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310
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311 #[test]
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312 fn escape_pattern_test() {
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313 let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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314 assert_eq!(escape_pattern(untouched), untouched.to_vec());
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315 // All escape codes
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316 assert_eq!(
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317 escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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318 br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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319 .to_vec()
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320 );
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321 }
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322
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323 #[test]
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324 fn glob_test() {
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325 assert_eq!(glob_to_re(br#"?"#), br#"."#);
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326 assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#);
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327 assert_eq!(glob_to_re(br#"**"#), br#".*"#);
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328 assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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329 assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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330 assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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331 assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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332 assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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333 }
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334
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335 #[test]
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336 fn test_parse_pattern_file_contents() {
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337 let lines = b"syntax: glob\n*.elc";
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338
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339 assert_eq!(
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340 vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())],
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341 parse_pattern_file_contents(lines, b"file_path", false).0,
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342 );
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343
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344 let lines = b"syntax: include\nsyntax: glob";
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345
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346 assert_eq!(
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347 parse_pattern_file_contents(lines, b"file_path", false).0,
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348 vec![]
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349 );
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350 let lines = b"glob:**.o";
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351 assert_eq!(
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352 parse_pattern_file_contents(lines, b"file_path", false).0,
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353 vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
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354 );
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355 }
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356
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357 #[test]
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358 fn test_build_single_regex_shortcut() {
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359 assert_eq!(
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360 br"(?:/|$)".to_vec(),
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361 build_single_regex(b"rootglob", b"", b"").unwrap()
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362 );
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363 assert_eq!(
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364 br"whatever(?:/|$)".to_vec(),
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365 build_single_regex(b"rootglob", b"whatever", b"").unwrap()
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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366 );
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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367 assert_eq!(
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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368 br"[^/]*\.o".to_vec(),
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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369 build_single_regex(b"rootglob", b"*.o", b"").unwrap()
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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370 );
48f1f864d928 rust-regex: fix shortcut for exact matches
Rapha?l Gom?s <rgomes@octobus.net>
parents: 42453
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371 }
42349
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
Rapha?l Gom?s <rgomes@octobus.net>
parents:
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372 }